Perhaps you should try some spelling variations:
dang xay » dang van, van xay
thanh vi » thanh va, thanh ve, nhanh vi
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cam loc » cam lo
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
y dang » ky dang, 2 dang, _ dang
loc va » hoc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y dang xay hoi. ((hieu ve) or (hieu va)) cam loc va ((thanh vi) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xay hoi. ((hieu ve) OR (hieu va)) cam loc va ((thanh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang xay hoi. ((hieu ve) or (hieu va)) cam loc va ((thanh vi) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xay hoi. ((hieu ve) or (hieu va)) cam loc va ((thanh vi) OR (hanh vi)) cua tre*.